fix(agents): stop falsely reporting saved agent edits on external OpenCode; make model-selector shortcut customizable (#1839)

* feat(shortcuts): make 'Open model selector' shortcut customizable

Lets users remap the model selector shortcut (e.g. to Ctrl+M) via
Settings > OpenChamber > Shortcuts, matching OpenCode's quick
model-switch keybinding workflow.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(agents): surface manual-restart needed when on external OpenCode

Agent prompt/permission/settings edits are written to disk, but an
external OpenCode server (skip-start or auto-detected on the default
port) is not owned by OpenChamber and is only health-probed on config
change, so it keeps serving its startup-cached config until restarted.
The API previously claimed a successful reload, so the UI silently
reverted the edit to the stale/default value on refresh.

Now refreshOpenCodeAfterConfigChange reports whether a real reload
happened; agent routes return requiresManualRestart for external mode;
and the agents UI keeps the saved values and warns the user to restart
their OpenCode server instead of showing a false success. Managed mode
behavior is unchanged (process is restarted and reload is live).

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

---------

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/i18n/messages/es.settings.ts

@@ -365,12 +365,14 @@ export const settingsDict = {
   "settings.agents.sidebar.toast.agentExists": "Ya existe un agente con este nombre",
   "settings.agents.sidebar.toast.removeOldAfterRenameFailed": "No se pudo eliminar el antiguo agente después del cambio de nombre",
   "settings.agents.sidebar.toast.renameFailed": "No se pudo cambiar el nombre del agente",
+  "settings.agents.sidebar.toast.agentRenamed": "Agente renombrado a \"{name}\"",
   "settings.agents.page.toast.permissionNameRequired": "Se requiere el nombre del permiso",
   "settings.agents.page.toast.created": "Agente creado correctamente",
   "settings.agents.page.toast.updated": "Agente actualizado correctamente",
   "settings.agents.page.toast.createFailed": "No se pudo crear el agente",
   "settings.agents.page.toast.updateFailed": "No se pudo actualizar el agente",
   "settings.agents.page.toast.saveUnexpectedError": "Ocurrió un error al guardar",
+  "settings.agents.page.toast.savedManualRestart": "Guardado en disco. Reinicia tu servidor OpenCode conectado para aplicar los cambios.",
   "settings.agents.page.empty.title": "Selecciona un agente desde la barra lateral",
   "settings.agents.page.empty.description": "o crea uno nuevo",
   "settings.agents.page.title.new": "Nuevo agente",
@@ -926,6 +928,7 @@ export const settingsDict = {
   "settings.openchamber.keyboardShortcuts.action.cycle_agent.label": "Cambiar agente",
   "settings.openchamber.keyboardShortcuts.action.cycle_favorite_model_forward.label": "Siguiente modelo favorito",
   "settings.openchamber.keyboardShortcuts.action.cycle_favorite_model_backward.label": "Modelo favorito anterior",
+  "settings.openchamber.keyboardShortcuts.action.open_model_selector.label": "Abrir selector de modelo",
   "settings.openchamber.keyboardShortcuts.action.expand_input.label": "Expandir entrada",
   "settings.openchamber.keyboardShortcuts.action.open_timeline_dialog.label": "Abrir línea de tiempo de conversación",
   "settings.projects.sidebar.total": "Total {count}",